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- Committer: Teddy Hogeborn
- Date: 2008-08-10 20:35:01 UTC
- mfrom: (24.1.42 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080810203501-euh3qcf1nopilksm
Merge.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
mandos-client.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
22
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), getgid(),
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
61
59
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
66
74
67
#define BUFFER_SIZE 256
75
68
76
#define PDIR "/lib/mandos/plugins.d"
77
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
78
79
const char *argp_program_version = "plugin-runner " VERSION;
69
const char *argp_program_version = "mandos-client 1.0";
80
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
71
82
typedef struct plugin{
83
char *name; /* can be NULL or any plugin name */
84
char **argv;
85
int argc;
86
char **environ;
87
int envc;
88
bool disabled;
89
90
/* Variables used for running processes*/
72
struct process;
73
74
typedef struct process{
91
75
pid_t pid;
92
76
int fd;
93
77
char *buffer;
94
78
size_t buffer_size;
95
79
size_t buffer_length;
96
80
bool eof;
97
volatile sig_atomic_t completed;
81
bool completed;
98
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
99
91
struct plugin *next;
100
92
} plugin;
101
93
102
static plugin *plugin_list = NULL;
103
104
/* Gets an existing plugin based on name,
105
or if none is found, creates a new one */
106
static plugin *getplugin(char *name){
107
/* Check for existing plugin with that name */
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
if((p->name == name)
110
or (p->name and name and (strcmp(p->name, name) == 0))){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
if ((p->name == name)
97
or (p->name and name and (strcmp(p->name, name) == 0))){
111
98
return p;
112
99
}
113
100
}
114
101
/* Create a new plugin */
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
119
if(new_plugin == NULL){
120
return NULL;
121
}
122
char *copy_name = NULL;
123
if(name != NULL){
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
127
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
131
return NULL;
132
}
133
}
134
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
139
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
143
if(new_plugin->argv == NULL){
144
int e = errno;
145
free(copy_name);
146
free(new_plugin);
147
errno = e;
148
return NULL;
149
}
150
new_plugin->argv[0] = copy_name;
102
plugin *new_plugin = malloc(sizeof(plugin));
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
108
new_plugin->argv = malloc(sizeof(char *) * 2);
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
new_plugin->argv[0] = name;
151
114
new_plugin->argv[1] = NULL;
152
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
156
if(new_plugin->environ == NULL){
157
int e = errno;
158
free(copy_name);
159
free(new_plugin->argv);
160
free(new_plugin);
161
errno = e;
162
return NULL;
163
}
164
new_plugin->environ[0] = NULL;
165
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
166
118
/* Append the new plugin to the list */
167
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
168
120
return new_plugin;
169
121
}
170
122
171
/* Helper function for add_argument and add_environment */
172
static bool add_to_char_array(const char *new, char ***array,
173
int *len){
174
/* Resize the pointed-to array to hold one more pointer */
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
179
/* Malloc check */
180
if(*array == NULL){
181
return false;
182
}
183
/* Make a copy of the new string */
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
188
if(copy == NULL){
189
return false;
190
}
191
/* Insert the copy */
192
(*array)[*len] = copy;
193
(*len)++;
194
/* Add a new terminating NULL pointer to the last element */
195
(*array)[*len] = NULL;
196
return true;
197
}
198
199
/* Add to a plugin's argument vector */
200
static bool add_argument(plugin *p, const char *arg){
201
if(p == NULL){
202
return false;
203
}
204
return add_to_char_array(arg, &(p->argv), &(p->argc));
205
}
206
207
/* Add to a plugin's environment */
208
static bool add_environment(plugin *p, const char *def, bool replace){
209
if(p == NULL){
210
return false;
211
}
212
/* namelen = length of name of environment variable */
213
size_t namelen = (size_t)(strchrnul(def, '=') - def);
214
/* Search for this environment variable */
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
217
/* It already exists */
218
if(replace){
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
224
return false;
225
}
226
*e = new;
227
strcpy(*e, def);
228
}
229
return true;
230
}
231
}
232
return add_to_char_array(def, &(p->environ), &(p->envc));
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
233
132
}
234
133
235
134
/*
236
135
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
136
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
239
138
*/
240
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
139
static int set_cloexec_flag(int fd)
140
{
141
int ret = fcntl(fd, F_GETFD, 0);
242
142
/* If reading the flags failed, return error indication now. */
243
143
if(ret < 0){
244
144
return ret;
245
145
}
246
146
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
148
}
250
149
150
process *process_list = NULL;
251
151
252
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
253
153
status. */
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
256
while(true){
257
plugin *proc = plugin_list;
258
int status;
259
pid_t pid = waitpid(-1, &status, WNOHANG);
260
if(pid == 0){
261
/* Only still running child processes */
262
break;
263
}
264
if(pid == -1){
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
268
}
269
perror("waitpid");
270
}
271
272
/* A child exited, find it in process_list */
273
while(proc != NULL and proc->pid != pid){
274
proc = proc->next;
275
}
276
if(proc == NULL){
277
/* Process not found in process list */
278
continue;
279
}
280
proc->status = status;
281
proc->completed = 1;
282
}
283
errno = old_errno;
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
284
171
}
285
172
286
/* Prints out a password to stdout */
287
static bool print_out_password(const char *buffer, size_t length){
288
ssize_t ret;
289
for(size_t written = 0; written < length; written += (size_t)ret){
173
bool print_out_password(const char *buffer, size_t length){
174
size_t ret;
175
for(size_t written = 0; written < length; written += ret){
290
176
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
291
177
length - written));
292
178
if(ret < 0){
296
182
return true;
297
183
}
298
184
299
/* Removes and free a plugin from the plugin list */
300
static void free_plugin(plugin *plugin_node){
301
302
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
303
free(*arg);
304
}
305
free(plugin_node->argv);
306
for(char **env = plugin_node->environ; *env != NULL; env++){
307
free(*env);
308
}
309
free(plugin_node->environ);
310
free(plugin_node->buffer);
311
312
/* Removes the plugin from the singly-linked list */
313
if(plugin_node == plugin_list){
314
/* First one - simple */
315
plugin_list = plugin_list->next;
316
} else {
317
/* Second one or later */
318
for(plugin *p = plugin_list; p != NULL; p = p->next){
319
if(p->next == plugin_node){
320
p->next = plugin_node->next;
321
break;
322
}
323
}
324
}
325
326
free(plugin_node);
327
}
328
329
static void free_plugin_list(void){
330
while(plugin_list != NULL){
331
free_plugin(plugin_list);
332
}
333
}
334
335
185
int main(int argc, char *argv[]){
336
char *plugindir = NULL;
337
char *argfile = NULL;
338
FILE *conffp;
186
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
339
187
size_t d_name_len;
340
188
DIR *dir = NULL;
341
189
struct dirent *dirst;
342
190
struct stat st;
343
191
fd_set rfds_all;
344
192
int ret, maxfd = 0;
345
ssize_t sret;
346
193
uid_t uid = 65534;
347
194
gid_t gid = 65534;
348
195
bool debug = false;
350
197
struct sigaction old_sigchld_action;
351
198
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
352
199
.sa_flags = SA_NOCLDSTOP };
353
char **custom_argv = NULL;
354
int custom_argc = 0;
200
char *plus_options = NULL;
201
char **plus_argv = NULL;
355
202
356
203
/* Establish a signal handler */
357
204
sigemptyset(&sigchld_action.sa_mask);
358
205
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
if(ret == -1){
206
if(ret < 0){
360
207
perror("sigaddset");
361
exitstatus = EX_OSERR;
362
goto fallback;
208
exit(EXIT_FAILURE);
363
209
}
364
210
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
if(ret == -1){
211
if(ret < 0){
366
212
perror("sigaction");
367
exitstatus = EX_OSERR;
368
goto fallback;
213
exit(EXIT_FAILURE);
369
214
}
370
215
371
216
/* The options we understand. */
373
218
{ .name = "global-options", .key = 'g',
374
219
.arg = "OPTION[,OPTION[,...]]",
375
220
.doc = "Options passed to all plugins" },
376
{ .name = "global-env", .key = 'G',
377
.arg = "VAR=value",
378
.doc = "Environment variable passed to all plugins" },
379
221
{ .name = "options-for", .key = 'o',
380
222
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
381
223
.doc = "Options passed only to specified plugin" },
382
{ .name = "env-for", .key = 'E',
383
.arg = "PLUGIN:ENV=value",
384
.doc = "Environment variable passed to specified plugin" },
385
224
{ .name = "disable", .key = 'd',
386
225
.arg = "PLUGIN",
387
226
.doc = "Disable a specific plugin", .group = 1 },
388
{ .name = "enable", .key = 'e',
389
.arg = "PLUGIN",
390
.doc = "Enable a specific plugin", .group = 1 },
391
227
{ .name = "plugin-dir", .key = 128,
392
228
.arg = "DIRECTORY",
393
229
.doc = "Specify a different plugin directory", .group = 2 },
394
{ .name = "config-file", .key = 129,
395
.arg = "FILE",
396
.doc = "Specify a different configuration file", .group = 2 },
397
{ .name = "userid", .key = 130,
398
.arg = "ID", .flags = 0,
399
.doc = "User ID the plugins will run as", .group = 3 },
400
{ .name = "groupid", .key = 131,
401
.arg = "ID", .flags = 0,
402
.doc = "Group ID the plugins will run as", .group = 3 },
403
{ .name = "debug", .key = 132,
404
.doc = "Debug mode", .group = 4 },
405
/*
406
* These reproduce what we would get without ARGP_NO_HELP
407
*/
408
{ .name = "help", .key = '?',
409
.doc = "Give this help list", .group = -1 },
410
{ .name = "usage", .key = -3,
411
.doc = "Give a short usage message", .group = -1 },
412
{ .name = "version", .key = 'V',
413
.doc = "Print program version", .group = -1 },
230
{ .name = "userid", .key = 129,
231
.arg = "ID", .flags = 0,
232
.doc = "User ID the plugins will run as", .group = 2 },
233
{ .name = "groupid", .key = 130,
234
.arg = "ID", .flags = 0,
235
.doc = "Group ID the plugins will run as", .group = 2 },
236
{ .name = "debug", .key = 131,
237
.doc = "Debug mode", .group = 3 },
414
238
{ .name = NULL }
415
239
};
416
240
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
errno = 0;
419
switch(key){
420
char *tmp;
421
intmax_t tmpmax;
422
case 'g': /* --global-options */
423
{
424
char *plugin_option;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
427
break;
428
}
429
}
430
}
431
break;
432
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
434
break;
435
case 'o': /* --options-for */
436
{
437
char *option_list = strchr(arg, ':');
438
if(option_list == NULL){
439
argp_error(state, "No colon in \"%s\"", arg);
440
errno = EINVAL;
441
break;
442
}
443
*option_list = '\0';
444
option_list++;
445
if(arg[0] == '\0'){
446
argp_error(state, "Empty plugin name");
447
errno = EINVAL;
448
break;
449
}
450
char *option;
451
while((option = strsep(&option_list, ",")) != NULL){
452
if(not add_argument(getplugin(arg), option)){
453
break;
454
}
455
}
456
}
457
break;
458
case 'E': /* --env-for */
459
{
460
char *envdef = strchr(arg, ':');
461
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*envdef = '\0';
467
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
472
}
473
add_environment(getplugin(arg), envdef, true);
474
}
475
break;
476
case 'd': /* --disable */
477
{
478
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
481
}
482
}
483
break;
484
case 'e': /* --enable */
485
{
486
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
489
}
490
}
491
break;
492
case 128: /* --plugin-dir */
493
free(plugindir);
494
plugindir = strdup(arg);
495
break;
496
case 129: /* --config-file */
497
/* This is already done by parse_opt_config_file() */
498
break;
499
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
501
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
503
argp_error(state, "Bad user ID number: \"%s\", using %"
504
PRIdMAX, arg, (intmax_t)uid);
505
break;
506
}
507
uid = (uid_t)tmpmax;
508
break;
509
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
513
argp_error(state, "Bad group ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)gid);
515
break;
516
}
517
gid = (gid_t)tmpmax;
518
break;
519
case 132: /* --debug */
241
error_t parse_opt (int key, char *arg, struct argp_state *state) {
242
/* Get the INPUT argument from `argp_parse', which we know is a
243
pointer to our plugin list pointer. */
244
plugin **plugins = state->input;
245
switch (key) {
246
case 'g':
247
if (arg != NULL){
248
char *p = strtok(arg, ",");
249
do{
250
addargument(getplugin(NULL, plugins), p);
251
p = strtok(NULL, ",");
252
} while (p != NULL);
253
}
254
break;
255
case 'o':
256
if (arg != NULL){
257
char *name = strtok(arg, ":");
258
char *p = strtok(NULL, ":");
259
if(p != NULL){
260
p = strtok(p, ",");
261
do{
262
addargument(getplugin(name, plugins), p);
263
p = strtok(NULL, ",");
264
} while (p != NULL);
265
}
266
}
267
break;
268
case 'd':
269
if (arg != NULL){
270
getplugin(arg, plugins)->disabled = true;
271
}
272
break;
273
case 128:
274
plugindir = arg;
275
break;
276
case 129:
277
uid = (uid_t)strtol(arg, NULL, 10);
278
break;
279
case 130:
280
gid = (gid_t)strtol(arg, NULL, 10);
281
break;
282
case 131:
520
283
debug = true;
521
284
break;
522
/*
523
* These reproduce what we would get without ARGP_NO_HELP
524
*/
525
case '?': /* --help */
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
528
case -3: /* --usage */
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
argp_state_help(state, state->out_stream,
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
532
case 'V': /* --version */
533
fprintf(state->out_stream, "%s\n", argp_program_version);
534
exit(EXIT_SUCCESS);
535
break;
536
/*
537
* When adding more options before this line, remember to also add a
538
* "case" to the "parse_opt_config_file" function below.
539
*/
540
285
case ARGP_KEY_ARG:
541
/* Cryptsetup always passes an argument, which is an empty
542
string if "none" was specified in /etc/crypttab. So if
543
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
286
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
287
argp_usage (state);
546
288
}
547
default:
548
return ARGP_ERR_UNKNOWN;
549
}
550
return errno; /* Set to 0 at start */
551
}
552
553
/* This option parser is the same as parse_opt() above, except it
554
ignores everything but the --config-file option. */
555
error_t parse_opt_config_file(int key, char *arg,
556
__attribute__((unused))
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
560
case 'g': /* --global-options */
561
case 'G': /* --global-env */
562
case 'o': /* --options-for */
563
case 'E': /* --env-for */
564
case 'd': /* --disable */
565
case 'e': /* --enable */
566
case 128: /* --plugin-dir */
567
break;
568
case 129: /* --config-file */
569
free(argfile);
570
argfile = strdup(arg);
571
break;
572
case 130: /* --userid */
573
case 131: /* --groupid */
574
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
578
case ARGP_KEY_ARG:
579
break;
580
default:
581
return ARGP_ERR_UNKNOWN;
582
}
583
return errno;
584
}
585
586
struct argp argp = { .options = options,
587
.parser = parse_opt_config_file,
588
.args_doc = "",
289
plus_options = arg;
290
break;
291
case ARGP_KEY_END:
292
break;
293
default:
294
return ARGP_ERR_UNKNOWN;
295
}
296
return 0;
297
}
298
299
plugin *plugin_list = NULL;
300
301
struct argp argp = { .options = options, .parser = parse_opt,
302
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
589
303
.doc = "Mandos plugin runner -- Run plugins" };
590
304
591
/* Parse using parse_opt_config_file() in order to get the custom
592
config file location, if any. */
593
ret = argp_parse(&argp, argc, argv,
594
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
595
NULL, NULL);
596
switch(ret){
597
case 0:
598
break;
599
case ENOMEM:
600
default:
601
errno = ret;
602
perror("argp_parse");
603
exitstatus = EX_OSERR;
604
goto fallback;
605
case EINVAL:
606
exitstatus = EX_USAGE;
607
goto fallback;
608
}
609
610
/* Reset to the normal argument parser */
611
argp.parser = parse_opt;
612
613
/* Open the configfile if available */
614
if(argfile == NULL){
615
conffp = fopen(AFILE, "r");
616
} else {
617
conffp = fopen(argfile, "r");
618
}
619
if(conffp != NULL){
620
char *org_line = NULL;
621
char *p, *arg, *new_arg, *line;
622
size_t size = 0;
623
const char whitespace_delims[] = " \r\t\f\v\n";
624
const char comment_delim[] = "#";
625
626
custom_argc = 1;
627
custom_argv = malloc(sizeof(char*) * 2);
628
if(custom_argv == NULL){
305
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
306
if (ret == ARGP_ERR_UNKNOWN){
307
fprintf(stderr, "Unkown error while parsing arguments\n");
308
exitstatus = EXIT_FAILURE;
309
goto end;
310
}
311
312
if(plus_options){
313
/* This is a mangled argument in the form of
314
"+--option+--other-option=parameter+--yet-another-option", etc */
315
/* Make new argc and argv vars, and call argp_parse() again. */
316
plus_options++; /* skip the first '+' character */
317
const char delims[] = "+";
318
char *arg;
319
int new_argc = 1;
320
plus_argv = malloc(sizeof(char*) * 2);
321
if(plus_argv == NULL){
629
322
perror("malloc");
630
exitstatus = EX_OSERR;
631
goto fallback;
632
}
633
custom_argv[0] = argv[0];
634
custom_argv[1] = NULL;
635
636
/* for each line in the config file, strip whitespace and ignore
637
commented text */
638
while(true){
639
sret = getline(&org_line, &size, conffp);
640
if(sret == -1){
641
break;
642
}
643
644
line = org_line;
645
arg = strsep(&line, comment_delim);
646
while((p = strsep(&arg, whitespace_delims)) != NULL){
647
if(p[0] == '\0'){
648
continue;
649
}
650
new_arg = strdup(p);
651
if(new_arg == NULL){
652
perror("strdup");
653
exitstatus = EX_OSERR;
654
free(org_line);
655
goto fallback;
656
}
657
658
custom_argc += 1;
659
custom_argv = realloc(custom_argv, sizeof(char *)
660
* ((unsigned int) custom_argc + 1));
661
if(custom_argv == NULL){
662
perror("realloc");
663
exitstatus = EX_OSERR;
664
free(org_line);
665
goto fallback;
666
}
667
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
669
}
670
}
671
do {
672
ret = fclose(conffp);
673
} while(ret == EOF and errno == EINTR);
674
if(ret == EOF){
675
perror("fclose");
676
exitstatus = EX_IOERR;
677
goto fallback;
678
}
679
free(org_line);
680
} else {
681
/* Check for harmful errors and go to fallback. Other errors might
682
not affect opening plugins */
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
perror("fopen");
685
exitstatus = EX_OSERR;
686
goto fallback;
687
}
688
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
691
if(custom_argv != NULL){
692
ret = argp_parse(&argp, custom_argc, custom_argv,
693
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
694
NULL, NULL);
695
switch(ret){
696
case 0:
697
break;
698
case ENOMEM:
699
default:
700
errno = ret;
701
perror("argp_parse");
702
exitstatus = EX_OSERR;
703
goto fallback;
704
case EINVAL:
705
exitstatus = EX_CONFIG;
706
goto fallback;
707
}
708
}
709
710
/* Parse actual command line arguments, to let them override the
711
config file */
712
ret = argp_parse(&argp, argc, argv,
713
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
714
NULL, NULL);
715
switch(ret){
716
case 0:
717
break;
718
case ENOMEM:
719
default:
720
errno = ret;
721
perror("argp_parse");
722
exitstatus = EX_OSERR;
723
goto fallback;
724
case EINVAL:
725
exitstatus = EX_USAGE;
726
goto fallback;
323
exitstatus = EXIT_FAILURE;
324
goto end;
325
}
326
plus_argv[0] = argv[0];
327
plus_argv[1] = NULL;
328
arg = strtok(plus_options, delims); /* Get first argument */
329
while(arg != NULL){
330
new_argc++;
331
plus_argv = realloc(plus_argv, sizeof(char *)
332
* ((unsigned int) new_argc + 1));
333
if(plus_argv == NULL){
334
perror("realloc");
335
exitstatus = EXIT_FAILURE;
336
goto end;
337
}
338
plus_argv[new_argc-1] = arg;
339
plus_argv[new_argc] = NULL;
340
arg = strtok(NULL, delims); /* Get next argument */
341
}
342
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
343
if (ret == ARGP_ERR_UNKNOWN){
344
fprintf(stderr, "Unkown error while parsing arguments\n");
345
exitstatus = EXIT_FAILURE;
346
goto end;
347
}
727
348
}
728
349
729
350
if(debug){
733
354
for(char **a = p->argv; *a != NULL; a++){
734
355
fprintf(stderr, "\tArg: %s\n", *a);
735
356
}
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
737
for(char **a = p->environ; *a != NULL; a++){
738
fprintf(stderr, "\t%s\n", *a);
739
}
740
357
}
741
358
}
742
359
743
/* Strip permissions down to nobody */
360
ret = setuid(uid);
361
if (ret == -1){
362
perror("setuid");
363
}
364
744
365
setgid(gid);
745
if(ret == -1){
366
if (ret == -1){
746
367
perror("setgid");
747
368
}
748
ret = setuid(uid);
749
if(ret == -1){
750
perror("setuid");
369
370
dir = opendir(plugindir);
371
if(dir == NULL){
372
perror("Could not open plugin dir");
373
exitstatus = EXIT_FAILURE;
374
goto end;
751
375
}
752
376
753
/* Open plugin directory with close_on_exec flag */
377
/* Set the FD_CLOEXEC flag on the directory, if possible */
754
378
{
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
773
if(dir_fd == -1){
774
perror("Could not open plugin dir");
775
exitstatus = EX_UNAVAILABLE;
776
goto fallback;
777
}
778
779
#ifndef O_CLOEXEC
780
/* Set the FD_CLOEXEC flag on the directory */
781
ret = set_cloexec_flag(dir_fd);
782
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
785
exitstatus = EX_OSERR;
786
goto fallback;
787
}
788
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
goto fallback;
379
int dir_fd = dirfd(dir);
380
if(dir_fd >= 0){
381
ret = set_cloexec_flag(dir_fd);
382
if(ret < 0){
383
perror("set_cloexec_flag");
384
exitstatus = EXIT_FAILURE;
385
goto end;
386
}
796
387
}
797
388
}
798
389
799
390
FD_ZERO(&rfds_all);
800
391
801
/* Read and execute any executable in the plugin directory*/
802
392
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
393
dirst = readdir(dir);
806
394
807
/* All directory entries have been processed */
395
// All directory entries have been processed
808
396
if(dirst == NULL){
809
if(errno == EBADF){
397
if (errno == EBADF){
810
398
perror("readdir");
811
exitstatus = EX_IOERR;
812
goto fallback;
399
exitstatus = EXIT_FAILURE;
400
goto end;
813
401
}
814
402
break;
815
403
}
816
404
817
405
d_name_len = strlen(dirst->d_name);
818
406
819
/* Ignore dotfiles, backup files and other junk */
407
// Ignore dotfiles, backup files and other junk
820
408
{
821
409
bool bad_name = false;
822
410
824
412
825
413
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
826
414
".dpkg-old",
827
".dpkg-bak",
828
415
".dpkg-divert", NULL };
829
416
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
417
size_t pre_len = strlen(*pre);
838
425
break;
839
426
}
840
427
}
428
841
429
if(bad_name){
842
430
continue;
843
431
}
432
844
433
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
434
size_t suf_len = strlen(*suf);
846
435
if((d_name_len >= suf_len)
860
449
}
861
450
}
862
451
863
char *filename;
864
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
867
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
871
}
872
if(ret < 0){
873
perror("asprintf");
874
continue;
875
}
452
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
453
if (filename == NULL){
454
perror("malloc");
455
exitstatus = EXIT_FAILURE;
456
goto end;
457
}
458
strcpy(filename, plugindir); /* Spurious warning */
459
strcat(filename, "/"); /* Spurious warning */
460
strcat(filename, dirst->d_name); /* Spurious warning */
876
461
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
462
ret = stat(filename, &st);
463
if (ret == -1){
879
464
perror("stat");
880
free(filename);
881
continue;
465
exitstatus = EXIT_FAILURE;
466
goto end;
882
467
}
883
468
884
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
469
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
470
if(debug){
888
471
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
472
" with bad type or mode\n", filename);
891
474
free(filename);
892
475
continue;
893
476
}
894
895
plugin *p = getplugin(dirst->d_name);
896
if(p == NULL){
897
perror("getplugin");
898
free(filename);
899
continue;
900
}
901
if(p->disabled){
477
if(getplugin(dirst->d_name, &plugin_list)->disabled){
902
478
if(debug){
903
479
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
904
480
dirst->d_name);
906
482
free(filename);
907
483
continue;
908
484
}
485
plugin *p = getplugin(dirst->d_name, &plugin_list);
909
486
{
910
487
/* Add global arguments to argument list for this plugin */
911
plugin *g = getplugin(NULL);
912
if(g != NULL){
913
for(char **a = g->argv + 1; *a != NULL; a++){
914
if(not add_argument(p, *a)){
915
perror("add_argument");
916
}
917
}
918
/* Add global environment variables */
919
for(char **e = g->environ; *e != NULL; e++){
920
if(not add_environment(p, *e, false)){
921
perror("add_environment");
922
}
923
}
924
}
925
}
926
/* If this plugin has any environment variables, we will call
927
using execve and need to duplicate the environment from this
928
process, too. */
929
if(p->environ[0] != NULL){
930
for(char **e = environ; *e != NULL; e++){
931
if(not add_environment(p, *e, false)){
932
perror("add_environment");
933
}
934
}
935
}
936
937
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
488
plugin *g = getplugin(NULL, &plugin_list);
489
for(char **a = g->argv + 1; *a != NULL; a++){
490
addargument(p, *a);
491
}
492
}
493
int pipefd[2];
494
ret = pipe(pipefd);
495
if (ret == -1){
940
496
perror("pipe");
941
exitstatus = EX_OSERR;
942
goto fallback;
497
exitstatus = EXIT_FAILURE;
498
goto end;
943
499
}
944
/* Ask OS to automatic close the pipe on exec */
945
500
ret = set_cloexec_flag(pipefd[0]);
946
501
if(ret < 0){
947
502
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
949
goto fallback;
503
exitstatus = EXIT_FAILURE;
504
goto end;
950
505
}
951
506
ret = set_cloexec_flag(pipefd[1]);
952
507
if(ret < 0){
953
508
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
955
goto fallback;
509
exitstatus = EXIT_FAILURE;
510
goto end;
956
511
}
957
512
/* Block SIGCHLD until process is safely in process list */
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
513
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
514
if(ret < 0){
962
515
perror("sigprocmask");
963
exitstatus = EX_OSERR;
964
goto fallback;
965
}
966
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
971
if(pid == -1){
972
perror("fork");
973
exitstatus = EX_OSERR;
974
goto fallback;
975
}
516
exitstatus = EXIT_FAILURE;
517
goto end;
518
}
519
// Starting a new process to be watched
520
pid_t pid = fork();
976
521
if(pid == 0){
977
522
/* this is the child process */
978
523
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
524
if(ret < 0){
980
525
perror("sigaction");
981
_exit(EX_OSERR);
526
_exit(EXIT_FAILURE);
982
527
}
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
528
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
529
if(ret < 0){
985
530
perror("sigprocmask");
986
_exit(EX_OSERR);
531
_exit(EXIT_FAILURE);
987
532
}
988
533
989
534
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
535
if(ret == -1){
991
536
perror("dup2");
992
_exit(EX_OSERR);
537
_exit(EXIT_FAILURE);
993
538
}
994
539
995
540
if(dirfd(dir) < 0){
997
542
above and must now close it manually here. */
998
543
closedir(dir);
999
544
}
1000
if(p->environ[0] == NULL){
1001
if(execv(filename, p->argv) < 0){
1002
perror("execv");
1003
_exit(EX_OSERR);
1004
}
1005
} else {
1006
if(execve(filename, p->argv, p->environ) < 0){
1007
perror("execve");
1008
_exit(EX_OSERR);
1009
}
545
if(execv(filename, p->argv) < 0){
546
perror("execv");
547
_exit(EXIT_FAILURE);
1010
548
}
1011
549
/* no return */
1012
550
}
1013
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
551
/* parent process */
1016
552
free(filename);
1017
plugin *new_plugin = getplugin(dirst->d_name);
1018
if(new_plugin == NULL){
1019
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
553
close(pipefd[1]); /* close unused write end of pipe */
554
process *new_process = malloc(sizeof(process));
555
if (new_process == NULL){
556
perror("malloc");
557
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
558
if(ret < 0){
1024
perror("sigprocmask");
559
perror("sigprocmask");
1025
560
}
1026
exitstatus = EX_OSERR;
1027
goto fallback;
561
exitstatus = EXIT_FAILURE;
562
goto end;
1028
563
}
1029
564
1030
new_plugin->pid = pid;
1031
new_plugin->fd = pipefd[0];
1032
565
*new_process = (struct process){ .pid = pid,
566
.fd = pipefd[0],
567
.next = process_list };
568
// List handling
569
process_list = new_process;
1033
570
/* Unblock SIGCHLD so signal handler can be run if this process
1034
571
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
572
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
573
if(ret < 0){
1039
574
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
1041
goto fallback;
1042
}
1043
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
1046
1047
if(maxfd < new_plugin->fd){
1048
maxfd = new_plugin->fd;
1049
}
1050
}
1051
1052
TEMP_FAILURE_RETRY(closedir(dir));
575
exitstatus = EXIT_FAILURE;
576
goto end;
577
}
578
579
FD_SET(new_process->fd, &rfds_all);
580
581
if (maxfd < new_process->fd){
582
maxfd = new_process->fd;
583
}
584
585
}
586
587
/* Free the plugin list */
588
for(plugin *next; plugin_list != NULL; plugin_list = next){
589
next = plugin_list->next;
590
free(plugin_list->argv);
591
free(plugin_list);
592
}
593
594
closedir(dir);
1053
595
dir = NULL;
1054
free_plugin(getplugin(NULL));
1055
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
1057
if(p->pid != 0){
1058
break;
1059
}
1060
if(p->next == NULL){
1061
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1062
" directory?\n");
1063
free_plugin_list();
1064
}
596
597
if (process_list == NULL){
598
fprintf(stderr, "No plugin processes started. Incorrect plugin"
599
" directory?\n");
600
process_list = NULL;
1065
601
}
1066
1067
/* Main loop while running plugins exist */
1068
while(plugin_list){
602
while(process_list){
1069
603
fd_set rfds = rfds_all;
1070
604
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
605
if (select_ret == -1){
1072
606
perror("select");
1073
exitstatus = EX_OSERR;
1074
goto fallback;
607
exitstatus = EXIT_FAILURE;
608
goto end;
1075
609
}
1076
610
/* OK, now either a process completed, or something can be read
1077
611
from one of them */
1078
for(plugin *proc = plugin_list; proc != NULL;){
612
for(process *proc = process_list; proc ; proc = proc->next){
1079
613
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
614
if(proc->eof and proc->completed){
1081
615
/* Only accept the plugin output if it exited cleanly */
1082
616
if(not WIFEXITED(proc->status)
1083
617
or WEXITSTATUS(proc->status) != 0){
1084
618
/* Bad exit by plugin */
1085
1086
619
if(debug){
1087
620
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
621
fprintf(stderr, "Plugin %u exited with status %d\n",
622
(unsigned int) (proc->pid),
1091
623
WEXITSTATUS(proc->status));
1092
} else if(WIFSIGNALED(proc->status)){
1093
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1094
" signal %d: %s\n", proc->name,
1095
(intmax_t) (proc->pid),
1096
WTERMSIG(proc->status),
1097
strsignal(WTERMSIG(proc->status)));
624
} else if(WIFSIGNALED(proc->status)) {
625
fprintf(stderr, "Plugin %u killed by signal %d\n",
626
(unsigned int) (proc->pid),
627
WTERMSIG(proc->status));
1098
628
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
629
fprintf(stderr, "Plugin %d dumped core\n",
630
(unsigned int) (proc->pid));
1101
631
}
1102
632
}
1103
1104
633
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
634
FD_CLR(proc->fd, &rfds_all);
1108
635
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
636
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1113
637
if(ret < 0){
1114
638
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
1116
goto fallback;
1117
}
1118
1119
plugin *next_plugin = proc->next;
1120
free_plugin(proc);
1121
proc = next_plugin;
1122
639
exitstatus = EXIT_FAILURE;
640
goto end;
641
}
642
/* Delete this process entry from the list */
643
if(process_list == proc){
644
/* First one - simple */
645
process_list = proc->next;
646
} else {
647
/* Second one or later */
648
for(process *p = process_list; p != NULL; p = p->next){
649
if(p->next == proc){
650
p->next = proc->next;
651
break;
652
}
653
}
654
}
1123
655
/* We are done modifying process list, so unblock signal */
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
656
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
657
NULL);
1127
658
if(ret < 0){
1128
659
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
1130
goto fallback;
1131
}
1132
1133
if(plugin_list == NULL){
1134
break;
1135
}
1136
1137
continue;
660
}
661
free(proc->buffer);
662
free(proc);
663
/* We deleted this process from the list, so we can't go
664
proc->next. Therefore, start over from the beginning of
665
the process list */
666
break;
1138
667
}
1139
1140
668
/* This process exited nicely, so print its buffer */
1141
1142
bool bret = print_out_password(proc->buffer,
1143
proc->buffer_length);
669
670
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1144
671
if(not bret){
1145
672
perror("print_out_password");
1146
exitstatus = EX_IOERR;
673
exitstatus = EXIT_FAILURE;
1147
674
}
1148
goto fallback;
675
goto end;
1149
676
}
1150
1151
677
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
678
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
679
/* This process had nothing to say at this time */
1156
proc = proc->next;
1157
680
continue;
1158
681
}
1159
682
/* Before reading, make the process' data buffer large enough */
1160
683
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
684
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
685
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
686
if (proc->buffer == NULL){
1164
687
perror("malloc");
1165
exitstatus = EX_OSERR;
1166
goto fallback;
688
exitstatus = EXIT_FAILURE;
689
goto end;
1167
690
}
1168
691
proc->buffer_size += BUFFER_SIZE;
1169
692
}
1170
693
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1175
if(sret < 0){
694
ret = read(proc->fd, proc->buffer + proc->buffer_length,
695
BUFFER_SIZE);
696
if(ret < 0){
1176
697
/* Read error from this process; ignore the error */
1177
proc = proc->next;
1178
698
continue;
1179
699
}
1180
if(sret == 0){
700
if(ret == 0){
1181
701
/* got EOF */
1182
702
proc->eof = true;
1183
703
} else {
1184
proc->buffer_length += (size_t) sret;
704
proc->buffer_length += (size_t) ret;
1185
705
}
1186
706
}
1187
707
}
1188
708
1189
1190
fallback:
1191
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1194
/* Fallback if all plugins failed, none are found or an error
1195
occured */
709
if(process_list == NULL){
1196
710
bool bret;
1197
711
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1198
712
char *passwordbuffer = getpass("Password: ");
1199
size_t len = strlen(passwordbuffer);
1200
/* Strip trailing newline */
1201
if(len > 0 and passwordbuffer[len-1] == '\n'){
1202
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1203
len--;
713
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
714
if(not bret){
715
perror("print_out_password");
716
exitstatus = EXIT_FAILURE;
717
goto end;
1204
718
}
1205
bret = print_out_password(passwordbuffer, len);
719
bret = print_out_password("\n", 1);
1206
720
if(not bret){
1207
721
perror("print_out_password");
1208
exitstatus = EX_IOERR;
722
exitstatus = EXIT_FAILURE;
1209
723
}
1210
724
}
725
726
end:
1211
727
1212
728
/* Restore old signal handler */
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
if(ret == -1){
1215
perror("sigaction");
1216
exitstatus = EX_OSERR;
1217
}
1218
1219
if(custom_argv != NULL){
1220
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1221
free(*arg);
1222
}
1223
free(custom_argv);
729
sigaction(SIGCHLD, &old_sigchld_action, NULL);
730
731
free(plus_argv);
732
733
/* Free the plugin list */
734
for(plugin *next; plugin_list != NULL; plugin_list = next){
735
next = plugin_list->next;
736
free(plugin_list->argv);
737
free(plugin_list);
1224
738
}
1225
739
1226
740
if(dir != NULL){
1227
741
closedir(dir);
1228
742
}
1229
743
1230
/* Kill the processes */
1231
for(plugin *p = plugin_list; p != NULL; p = p->next){
1232
if(p->pid != 0){
1233
close(p->fd);
1234
ret = kill(p->pid, SIGTERM);
1235
if(ret == -1 and errno != ESRCH){
1236
/* Set-uid proccesses might not get closed */
1237
perror("kill");
1238
}
744
/* Free the process list and kill the processes */
745
for(process *next; process_list != NULL; process_list = next){
746
next = process_list->next;
747
close(process_list->fd);
748
ret = kill(process_list->pid, SIGTERM);
749
if(ret == -1 and errno != ESRCH){
750
/* set-uid proccesses migth not get closed */
751
perror("kill");
1239
752
}
753
free(process_list->buffer);
754
free(process_list);
1240
755
}
1241
756
1242
757
/* Wait for any remaining child processes to terminate */
1243
do {
758
do{
1244
759
ret = wait(NULL);
1245
760
} while(ret >= 0);
1246
761
if(errno != ECHILD){
1247
762
perror("wait");
1248
763
}
1249
764
1250
free_plugin_list();
1251
1252
free(plugindir);
1253
free(argfile);
1254
1255
765
return exitstatus;
1256
766
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0